Product Overview

The Pentair 356735Z Diffuser is a genuine OEM replacement component designed for select Pentair EQ Series commercial pool pumps. Primarily used with 15 HP EQ1500 configurations, this diffuser is also specified for certain EQ Series 3 HP and specialty 10 HP configurations.

The diffuser surrounds the pump impeller and helps direct water through the hydraulic assembly for efficient pressure and flow. Pentair EQ Series diffusers are manufactured from corrosion-resistant PPO resin and incorporate a replaceable bronze wear ring at the impeller interface.

Key Features

Genuine Pentair OEM Replacement: Factory replacement diffuser engineered for compatible Pentair EQ Series commercial pumps.

15 HP EQ Series Application: Designed for standard EQK1500 and EQKT1500 15 HP pump configurations.

Commercial-Duty Construction: Manufactured for demanding commercial swimming pool, aquatic facility, and water circulation applications.

PPO Resin Design: Corrosion-resistant diffuser construction provides durability in commercial pool environments.

Replaceable Bronze Wear Ring: Designed with a replaceable wear ring to help maintain proper clearance between the diffuser and impeller.

Benefits

Restores proper pump hydraulic performance

Genuine Pentair OEM replacement component

Helps direct water efficiently through the impeller assembly

Corrosion-resistant construction

Designed for demanding commercial circulation systems

Allows repair of the pump wet end without replacing the complete pump

Compatible with several standard and specialty EQ Series configurations

Specifications

Pool360 currently lists UPC 788379909871, 2.2 lb product weight, 9 × 9 × 7.5-inch shipping dimensions, and a one-year general warranty for 356735Z.

Warranty & Compatibility

Installation Information

Replacing the diffuser requires disassembly of the EQ Series pump wet end. Disconnect and lock out electrical power before servicing the pump.

While the pump is disassembled, inspect the impeller, diffuser wear ring, mechanical shaft seal, O-rings, and related hardware. Worn sealing or hydraulic components should be replaced before returning the pump to service.

Professional installation by a qualified commercial pool service technician is recommended.

Confirm Before Ordering

Pentair 356735Z is specified for select configurations including:

• EQK1500 – 15 HP
• EQKT1500 – 15 HP
• EQK1500 575V – 15 HP
• Select EQK1000 50 Hz – 10 HP
• Select EQK1000 explosion-proof 50 Hz – 10 HP
• Select EQW300 / EQK300 configurations – 3 HP

Pentair’s current replacement-parts documentation confirms 356735 as the diffuser for the standard 15 HP EQK1500/EQKT1500 pumps and several specialty EQ configurations.

Warranty Information

This replacement component carries a 1-year general warranty. Warranty eligibility and coverage may depend on installation, application, purchase channel, and current Pentair warranty requirements.

Customer-Facing Q&A

Q: Is 356735Z a genuine Pentair replacement part?
A: Yes. It is an OEM Pentair diffuser for compatible EQ Series commercial pumps.

Q: Does it fit a 15 HP EQK1500 pump?
A: Yes. Pentair specifies this diffuser for standard EQK1500 and EQKT1500 15 HP configurations.

Q: Is this diffuser only used on 15 HP pumps?
A: No. It is also used on certain 10 HP 50 Hz and 3 HP EQ Series configurations.

Q: Is the impeller included?
A: No. This listing is for the diffuser only. The impeller, motor, shaft seal, pump housing, and other components are sold separately unless otherwise stated.